all the grades disappeard from the timeline, in the color page there was nothing on the timeline but one node at default after this event
i saved a DRP (project_v2.6_bak) straightaway - before restoreing the saved v2.6 DRP, then re-saved that as v2.7
i made a new cache folder inside the project "v2.7_cache" to keep the old / dead caches aside for housekeeping, pointed Resolve to use that folder
I then kept on working, shipped the show the next day, and deleted the caches from all folders at the OS level
yesterday i opened "v2.6_bak" and pointed it to the new cache folder, the node tree now appears on the timeline...
i enable Smart cache in my default projects, i have plently of disk space avb, and it does not hurt anything to have it running, usualy it caches things that are playable rt anyway, but with HR444 caches taking very little space and 50-60Tb of fast storage avb.. "why not" is my working theory